Animating cape (Blender 2.79)
Holy smoke! You need to slow down the jump a lot! If you make the cape a more solid material, and slow down the jump a lot (Maybe to 5 frames). Also, what would make a better simulation would be to make the cape facing the opposite direction of the jump. AKA, if you jump -5 on the x axis, set the cape to be pointing towards the positive side.